<div dir="auto">That is a potential solution, but if SMA is recommending load shedding contactors, shouldn't they supply a device or kit to implement this? Or at least specify products or at a bare minimum provide better documentation on how and why to implement it. <div dir="auto"><br></div><div dir="auto">I still don't understand why it's recommended with Battery Protection Mode providing essentially the same function, unless you are trying to shed a subset of loads. <div dir="auto"><br></div><div dir="auto">Jason</div><div dir="auto"><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 22, 2021, 3:24 PM <<a href="mailto:drake.chamberlin@redwoodalliance.org">drake.chamberlin@redwoodalliance.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="font-size:10pt;font-family:Verdana,Geneva,sans-serif">
<p>Use series resistors around the coil. </p>
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<p id="m_-1386697014482611408reply-intro">On 2021-01-21 13:59, Jason Szumlanski wrote:</p>
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<div style="font-family:arial,helvetica,sans-serif">I just learned from the manufacturer that the mercury displacement relay's coil is rated for 43.2 to 52.80V. Obviously, the battery voltage can exceed 52.8 pretty significantly. Does the Sunny Island regulate the output voltage on this relay to 48V or is the actual battery voltage passed through on this terminal?</div>
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<div style="font-family:arial,helvetica,sans-serif">The more I read about this load shedding strategy, the more it seems overly complicated. It's also another thing to fail. If the N.O. contactor coil fails, the loads to the house are going to lose power. That's not good for a remote installation. I guess you have to weigh battery protection with how critical the loads are.</div>
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<div style="font-family:arial,helvetica,sans-serif">I'm wondering why the internal Battery Preservation Mode isn't sufficient enough. What's the purpose of load shedding if the BPM does effectively the same thing. I can see perhaps shedding some parts of the load and that is a nice feature, but to protect the batteries, why isn't BPM enough?</div>
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<div style="font-family:arial,helvetica,sans-serif">Jason</div>
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<div dir="ltr">On Tue, Jan 19, 2021 at 8:48 PM Mac Lewis <<a href="mailto:maclewis1@gmail.com" rel="noreferrer noreferrer" target="_blank">maclewis1@gmail.com</a>> wrote:</div>
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<div>I have done this with mercury displacement relays:</div>
<div><a href="https://mailtrack.io/trace/link/507c3cd242097f112c86a155d1e20d50857a422b?url=https%3A%2F%2Fwww.mdius.com%2Fmercury-relays%2Ftwo-pole-relays-contactors%2Ftwo-pole-100-amp&userId=1613865&signature=1f785f791758ce12" rel="noopener noreferrer noreferrer" target="_blank">https://www.mdius.com/mercury-relays/two-pole-relays-contactors/two-pole-100-amp</a></div>
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<div>They do have a 100A 2P 48V coil relay. They seem to work perfectly.</div>
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<div dir="ltr">On Tue, Jan 19, 2021 at 2:51 PM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" rel="noreferrer noreferrer" target="_blank">jason@floridasolardesigngroup.com</a>> wrote:</div>
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<div dir="auto">Does anyone know where I can get a load shedding contactor described in SMA documentation for use with a multi-function relay in a Sunny Island?
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<div dir="auto">Thanks,</div>
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<div dir="auto">Jason Szumlanski </div>
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Mac Lewis<br><br>
<p align="left"><span style="color:#000000;font-family:Verdana,Arial,Helvetica,sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:#305a78"><span style="font-family:'times new roman',serif">"Yo solo sé que no sé nada." </span><span style="font-weight:bold;color:#686868"><span style="font-family:'times new roman',serif">-Sócrates</span></span></span></span></span></p>
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